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Computers and Concrete Volume 38, Number 3, September 2026 , pages 429-451 DOI: https://doi.org/10.12989/cac.2026.38.3.02 |
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Study on the dynamic response of fresh concrete under surface vibration |
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Linjiang Yu, Qiuyue Chen, Liping He, Zhenghong Tian
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| Abstract | ||
| To investigate the dynamic response of fresh concrete under surface vibration, a mesoscopic model of fresh concrete subjected to surface vibration was established using the Discrete Element Method (DEM). The evolution characteristics of particle velocity fields, contact force chain networks, and internal energy absorption fields during the vibration process were systematically analyzed. The results indicate that the particle velocity field exhibits an axisymmetric distribution with the vertical centerline of the specimen as the symmetry axis. The velocity magnitude attenuated in a "fan-shaped" pattern from the bottom of the surface vibrator and transitioned to a "U-shaped" distribution, with the velocity magnitude decreasing from 10-1 m/s to 10-2 m/s, representing a significant attenuation range. The contact force chain network initially formed loop structures, subsequently evolved into "root-like" configurations, and ultimately underwent buckling to form buckled structures. The probability of normal contact force chains decreased with an increase in the normalized contact force (defined as contact force/average contact force), while the probability of tangential contact force chains increased initially and subsequently decreased with the normalized contact force. During vibration, the translational kinetic energy increased rapidly initially and then gradually stabilized, whereas the rotational kinetic energy increased initially, decreased subsequently, and finally stabilized. The average translational kinetic energy of particles in the entire specimen was 0.098 J, and the average rotational kinetic energy was approximately 0.0007 J, indicating that the rotational kinetic energy of particles was negligible compared to the translational kinetic energy. These findings provide valuable insights into the compaction mechanisms of fresh concrete under surface vibration and offer guidance for optimizing surface vibration in concrete construction. | ||
| Key Words | ||
| compactness; discrete element; energy; fresh concrete; mesoscopic dynamic response; surface vibration | ||
| Address | ||
| Linjiang Yu, Qiuyue Chen, Liping He: China Communications Fourth Navigation Engineering Bureau Co., LTD., Guangzhou 510290, China Zhenghong Tian: Hohai University, College of Water Conservancy and Hydropower, Nanjing, 210024, China | ||